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NATO UNCLASSIFIED 2 Abstract and Conditions of Release Abstract The work described in this presentation was carried out under customer funded projects and N , conducted by NC3A on behalf of AC322(SC/6-AHWG/3). This presentation gives a general introduction to the work, which is documented in NC3A Technical Note-881 and NC3A Technical Memorandum-946. This presentation is a working paper that may not be cited as representing formally approved NC3A opinions, conclusions or recommendations.Abstract The work described in this presentation was carried out under customer funded projects and N , conducted by NC3A on behalf of AC322(SC/6-AHWG/3). This presentation gives a general introduction to the work, which is documented in NC3A Technical Note-881 and NC3A Technical Memorandum-946. This presentation is a working paper that may not be cited as representing formally approved NC3A opinions, conclusions or recommendations.

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NATO UNCLASSIFIED 16 Need for Precision Weighted Ranking Graphs show variation between intelligibility tests performed by the 3 test labsGraphs show variation between intelligibility tests performed by the 3 test labs General trends are the sameGeneral trends are the same Absolute scores varyAbsolute scores vary Need to combine all results accurately and fairlyNeed to combine all results accurately and fairly Simple scaling is not sufficientSimple scaling is not sufficient Graphs show variation between intelligibility tests performed by the 3 test labsGraphs show variation between intelligibility tests performed by the 3 test labs General trends are the sameGeneral trends are the same Absolute scores varyAbsolute scores vary Need to combine all results accurately and fairlyNeed to combine all results accurately and fairly Simple scaling is not sufficientSimple scaling is not sufficient US24 CELP FR24 CVSD TU24 US12 LPC TU12 FR12

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NATO UNCLASSIFIED 23 Specific Results - Language Dependency Language dependency of all tested codersLanguage dependency of all tested coders The closer a point lies to the x=y diagonal, the less language dependant the voice coderThe closer a point lies to the x=y diagonal, the less language dependant the voice coder Language dependency of all tested codersLanguage dependency of all tested coders The closer a point lies to the x=y diagonal, the less language dependant the voice coderThe closer a point lies to the x=y diagonal, the less language dependant the voice coder